Arago's rotations is an observable phenomenon and effect discovered by François Arago in 1824. In the effect, as a copper disc is rotated in its own plane, and if a magnetic needle be freely suspended on a pivot over the disc, the needle will rotate with the disc. On the other hand, if the needle is fixed it will tend to retard the motion of the disc.
- Walter Baily, A Mode of producing Arago's Rotation. June 28, 1879. (Philosophical magazine: a journal of theoretical, experimental and applied physics. Taylor & Francis., 1879)
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